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Circuit Symbols of Electronic Components

Circuit Symbols of Electronic Components Home | Map | Projects | Construction | Soldering | Study | Components | 555 | Symbols |. FAQ | Links Circuit Symbols Wires | Supplies | Output devices | Switches | Resistors | Capacitors | Diodes |. Transistors | Audio & Radio | Meters | Sensors | Logic gates | Download Symbols Next Page: Electricity and the Electron Also see: Circuit Diagrams Circuit Symbols are used in Circuit diagrams which show how a Circuit is connected together. The actual layout of the Components is usually quite different from the Circuit diagram.

Battery Supplies electrical energy. A battery is more than one cell. The larger terminal (on the left) is positive (+). DC supply Supplies electrical energy.

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Transcription of Circuit Symbols of Electronic Components

1 Circuit Symbols of Electronic Components Home | Map | Projects | Construction | Soldering | Study | Components | 555 | Symbols |. FAQ | Links Circuit Symbols Wires | Supplies | Output devices | Switches | Resistors | Capacitors | Diodes |. Transistors | Audio & Radio | Meters | Sensors | Logic gates | Download Symbols Next Page: Electricity and the Electron Also see: Circuit Diagrams Circuit Symbols are used in Circuit diagrams which show how a Circuit is connected together. The actual layout of the Components is usually quite different from the Circuit diagram.

2 To build a Circuit you need a different diagram showing the layout of the parts on stripboard or printed Circuit board. Wires and connections Component Circuit Symbol Function of Component To pass current very easily from one part of a Wire Circuit to another. A 'blob' should be drawn where wires are connected (joined), but it is sometimes Wires joined omitted. Wires connected at 'crossroads'. should be staggered slightly to form two T-junctions, as shown on the right. In complex diagrams it is often necessary to draw wires crossing even though they are not connected.

3 I prefer the 'bridge' symbol shown Wires not joined on the right because the simple crossing on the left may be misread as a join where you have forgotten to add a 'blob'! Power Supplies Component Circuit Symbol Function of Component Supplies electrical energy. Cell The larger terminal (on the left) is positive (+). A single cell is often called a battery, but strictly a battery is two or more cells joined together. 1 of 9 10/3/11 11:53 AM. Circuit Symbols of Electronic Components Supplies electrical energy. A battery is more Battery than one cell.

4 The larger terminal (on the left) is positive (+). Supplies electrical energy. DC supply DC = Direct Current, always flowing in one direction. Supplies electrical energy. AC supply AC = Alternating Current, continually changing direction. A safety device which will 'blow' (melt) if the Fuse current flowing through it exceeds a specified value. Two coils of wire linked by an iron core. Transformers are used to step up (increase). and step down (decrease) AC voltages. Transformer Energy is transferred between the coils by the magnetic field in the core.

5 There is no electrical connection between the coils. A connection to earth. For many Electronic circuits this is the 0V (zero volts) of the power Earth supply, but for mains electricity and some (Ground). radio circuits it really means the earth. It is also known as ground. Output Devices: Lamps, Heater, Motor, etc. Component Circuit Symbol Function of Component A transducer which converts electrical energy to light. This symbol is used for a lamp Lamp (lighting). providing illumination, for example a car headlamp or torch bulb. A transducer which converts electrical energy to light.

6 This symbol is used for a lamp which Lamp (indicator). is an indicator, for example a warning light on a car dashboard. A transducer which converts electrical energy Heater to heat. 2 of 9 10/3/11 11:53 AM. Circuit Symbols of Electronic Components A transducer which converts electrical energy Motor to kinetic energy (motion). A transducer which converts electrical energy Bell to sound. A transducer which converts electrical energy Buzzer to sound. A coil of wire which creates a magnetic field when current passes through it. It may have Inductor an iron core inside the coil.

7 It can be used as (Coil, Solenoid). a transducer converting electrical energy to mechanical energy by pulling on something. Switches Component Circuit Symbol Function of Component A push switch allows current to flow only Push Switch when the button is pressed. This is the (push-to-make). switch used to operate a doorbell. This type of push switch is normally closed Push-to-Break (on), it is open (off) only when the button is Switch pressed. SPST = Single Pole, Single Throw. On-Off Switch An on-off switch allows current to flow only (SPST).

8 When it is in the closed (on) position. SPDT = Single Pole, Double Throw. A 2-way changeover switch directs the 2-way Switch flow of current to one of two routes (SPDT) according to its position. Some SPDT. switches have a central off position and are described as 'on-off-on'. DPST = Double Pole, Single Throw. Dual On-Off A dual on-off switch which is often used to Switch switch mains electricity because it can (DPST) isolate both the live and neutral connections. 3 of 9 10/3/11 11:53 AM. Circuit Symbols of Electronic Components DPDT = Double Pole, Double Throw.

9 Reversing This switch can be wired up as a reversing Switch switch for a motor. Some DPDT switches (DPDT). have a central off position. An electrically operated switch, for example a 9V battery Circuit connected to Relay the coil can switch a 230V AC mains Circuit . NO = Normally Open, COM = Common, NC = Normally Closed. Resistors Component Circuit Symbol Function of Component A resistor restricts the flow of current, for example to limit the current passing through Resistor an LED. A resistor is used with a capacitor in a timing Circuit . Some publications still use the old resistor symbol: This type of variable resistor with 2 contacts (a rheostat) is usually used to control current.

10 Variable Resistor Examples include: adjusting lamp brightness, (Rheostat) adjusting motor speed, and adjusting the rate of flow of charge into a capacitor in a timing Circuit . This type of variable resistor with 3 contacts (a potentiometer) is usually used to control Variable Resistor voltage. It can be used like this as a (Potentiometer). transducer converting position (angle of the control spindle) to an electrical signal. This type of variable resistor (a preset) is operated with a small screwdriver or similar tool. It is designed to be set when the Circuit Variable Resistor is made and then left without further (Preset).


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